> > Does anyone know examples of such menus that are accessible?
>
> That are accessible - I'm not sure, that are keyboard accessible -
> http://jibbering.com/ , http://jibbering.com/accessibility/menu.html and
> http://jibbering.com/accessibility/menue.html are 3 versions of the same
> menu script which seem to be accessible in a number of browsers, Early
> Mozilla's not due to a bug in those w.r.t. to tabbing to positioned
> links.
Anyone who has the wherewithall to write the javascript for such a menu as
the original example should be able to make it keyboard-accessible.
Unfortunately I think they will be utterly opaque to screen readers. This
is just an opinion as a programmer who is a relative newbie to
accessibility.